2012年（1008）
分类：
2012-08-01 11:11:25
原文地址：s3c2440触摸屏驱动 作者：luozhiyong131
//====================================================================================
//文 件 名: TouchPanel.c
//功能描述: 触摸屏驱动程序(TX2440A)
//维护记录: 2009-08-18 V1.0
//====================================================================================
#include "def.h"
#include "2440lib.h"
#include "2440addr.h"
#include "option.h"
#include "uart.h"
#include "TFT_API.h"
#include "TouchPanel.h"
#define LOOP 50
#define ADCPRS 39
short LeftBound = TOUCH_DEFAULT_LB; // 左边缘对应的AD转换值(16bit)
short RightBound = TOUCH_DEFAULT_RB; // 右边缘对应的AD转换值(16bit)
short TopBound = TOUCH_DEFAULT_TB; // 上边缘对应的AD转换值(16bit)
short BottomBound = TOUCH_DEFAULT_BB; // 下边缘对应的AD转换值(16bit)
unsigned int TempADCx;
unsigned int TempADCy;
short ADC_Counter;
short Debounce_Counter;
short DebounceX;
short DebounceY;
short ResultX;
short ResultY;
int count=0;
volatile int xdata, ydata;
void __irq Adc_or_TsSep(void);
//=============================================================
//语法格式：void Touch_Init(void)
//实现功能：触摸屏驱动初始化，初始化变量、ADC、IO等，并开启ADC中断
//参数： 无
//返回值： 无
//=============================================================
void Touch_Init(void)
{
TempADCx = 0;
TempADCy = 0;
ADC_Counter = 0;
Debounce_Counter = 0;
DebounceX = -1;
DebounceY = -1;
ResultX = -1;
ResultY = -1;
rGPGCON |= 0xff000000;
rGPGUP &= 0x0f;
rADCDLY = (50000); // ADC Start or Interval Delay
rADCCON = (1<<14)|(ADCPRS<<6)|(0<<3)|(0<<2)|(0<<1)|(0);
// Enable Prescaler,Prescaler,AIN7/5 fix,Normal,Disable read start,No operation
rADCTSC = (0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);
// Down,YM:GND,YP:AIN5,XM:Hi-z,XP:AIN7,XP pullup En,Normal,Waiting for interrupt mode
if(rSRCPND &BIT_ADC) rSRCPND |= BIT_ADC;
if(rINTPND & BIT_ADC) rINTPND |= BIT_ADC;
if(rSUBSRCPND & BIT_SUB_TC) rSUBSRCPND|= BIT_SUB_TC;
if(rSUBSRCPND & BIT_SUB_ADC_S)rSUBSRCPND |= BIT_SUB_ADC_S;
rINTMSK &=~(BIT_ADC);
rINTSUBMSK &=~(BIT_SUB_TC);
pISR_ADC = (unsigned)Adc_or_TsSep;
}
//=============================================================
//语法格式：void Touch_SetBound(unsigned short left, unsigned short right, unsigned short top, unsigned short bottom);
//实现功能：设置四个边缘对应的AD转换值，用于触摸屏校准
//参数： left: 左边缘对应的AD转换值(16bit)
// right: 右边缘对应的AD转换值(16bit)
// top: 上边缘对应的AD转换值(16bit)
// bottom: 下边缘对应的AD转换值(16bit)
//返回值： 无
//=============================================================
void Touch_SetBound(unsigned short left, unsigned short right, unsigned short top, unsigned short bottom)
{
LeftBound = left;
RightBound = right;
TopBound = top;
BottomBound = bottom;
}
//=============================================================
//语法格式：void __irq Adc_or_TsSep(void);
//实现功能：TC中断服务子程序
//参数： 无
//返回值： 无
//=============================================================
void __irq Adc_or_TsSep(void)
{
unsigned int i;
U32 PtX[6], PtY[6];
short TempX, TempY;
if(rADCDAT0&0x8000)
{
//Uart_Printf("\nStylus Up!!\n");
rADCTSC&=0xff; // Set stylus down interrupt bit
}
//else
//Uart_Printf("\nStylus Down!!\n");
rADCTSC=(1<<3)|(1<<2); //Pull-up disable, Seq. X,Y postion measure.
rADCCON|=0x1; //start ADC
for (i = 0; i < 5; i++)
{
while(rADCCON & 0x1); //check if Enable_start is low
while(!(rADCCON & 0x8000)); //check if EC(End of Conversion) flag is high, This line is necessary~!!
while(!(rSRCPND & (BIT_ADC))); //check if ADC is finished with interrupt bit
PtX[i]=(rADCDAT0&0x3ff);
PtY[i]=(rADCDAT1&0x3ff);
}
PtX[5]=(PtX[0]+PtX[1]+PtX[2]+PtX[3]+PtX[4])/5;
PtY[5]=(PtY[0]+PtY[1]+PtY[2]+PtY[3]+PtY[4])/5;
TempADCx = PtX[5];
TempADCy = PtY[5];
//check Stylus Up Interrupt.
rSUBSRCPND|=BIT_SUB_TC;
ClearPending(BIT_ADC);
rINTSUBMSK=~(BIT_SUB_TC);
rINTMSK=~(BIT_ADC);
rADCTSC =0xd3; //Waiting for interrupt
rADCTSC=rADCTSC|(1<<8); // Detect stylus up interrupt signal.
while(1) //to check Pen-up state
{
if(rSUBSRCPND & (BIT_SUB_TC)) //check if ADC is finished with interrupt bit
{
//Uart_Printf("Stylus Up Interrupt~!\n");
break; //if Stylus is up(1) state
}
}
// Uart_Printf("count=%03d XP=%04d, YP=%04d\n", count++, TempADCx, TempADCy); //X-position Conversion data
rADCTSC=rADCTSC&~(1<<8); // Detect stylus Down interrupt signal.
rSUBSRCPND|=BIT_SUB_TC;
rINTSUBMSK=~(BIT_SUB_TC); // Unmask sub interrupt (TC)
ClearPending(BIT_ADC);
TempX = TOUCH_WIDTH * (TOUCH_DEFAULT_RB - TempADCx) / (TOUCH_DEFAULT_RB - TOUCH_DEFAULT_LB);
TempY = TOUCH_HEIGHT * (TempADCy - TOUCH_DEFAULT_TB) / (TOUCH_DEFAULT_BB - TOUCH_DEFAULT_TB);
//Uart_Printf("TempADCx=%d, TempADCy=%d\n",TempADCx,TempADCy);
ResultX = (TempX ); // 保存坐标
ResultY = (TempY );
}
//=============================================================
//语法格式：short Touch_Get(short *x, short *y);
//实现功能：触摸屏获取触摸坐标函数
//参数： *x: 触摸点的横坐标; *y: 触摸点的纵坐标
//返回值： 无
//=============================================================
short Touch_Get(short *x, short *y)
{
if(ResultX != -1)
{
*x = ResultX;
*y = ResultY;
ResultX = -1;
ResultY = -1;
return 0;
}
else
{
*x = -1;
*y = -1;
return -1;
}
}
void Test_TouchPanel(void)
{
short X_Position[1],Y_Position[1]; // 保存返回的触摸笔位置
short x,y;
TFT_Init();
Touch_Init();
TFT_SetColor(COLOR_BLACK);
while(Uart_GetKey() != ESC_KEY)
{
if(Touch_Get(X_Position,Y_Position)!=-1)// 获取Touch Panel坐标
{
x = X_Position[0]; // 如果有触摸笔点中，保存X/Y坐标
y = Y_Position[0];
#if (LCD_Type == LCDW35)
y = 240 - y; // 根据实际情况，调整显示坐标
x = 320 - x;
#elif (LCD_Type == LCDW43)
y = y; // 根据实际情况，调整显示坐标
x = x;
#elif (LCD_Type == LCDA70)
y = y; // 根据实际情况，调整显示坐标
x = 800 - x;
#endif
TFT_Circle(x,y,8,COLOR_WHITE,PAINT_SOLID);// 显示圆点
Uart_Printf("x=%d, y=%d\n",x,y);
}
}
Uart_Printf("Test End!\n");
}
工程完整源代码
TouchPanel.rar
